title: Formation of N-bridgehead 1,2,5-thiadiazolium and selenadiazolium rings through an intramolecular cyclisation reaction.
abstract: Treatment of N-lithiopyridylketimide derivatives Li[R(C=N)py] (R=Ph, py) with ECl(2) (E=S, Se) affords the fused thiadiazolium and selenadiazolium salts [RC(6)H(4)N(2)E]Cl [1]Cl and [2]Cl containing a bridgehead N atom through intramolecular coordination.
authors.affiliation: Department of Chemistry, The University of Cambridge, Lensfield Road, Cambridge, UK CB2 1EW.
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Bacon
authors.forename: Dana J
authors.initials: DJ
authors.lastname: Eisler
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Melen
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Rawson
mesh_terms: D003500:Cyclization; D009584:Nitrogen / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*; D013830:Thiadiazoles / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D013830:Thiadiazoles; D012643:Selenium; D009584:Nitrogen